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Suppose that X is not orientable. Prove that X*Y is never orientable, no matter what manifold Y may be. (Hint: First show that X * R^L is not orientable. But every Y has an open subset diffeomorphic to R^L.)
One boat travelling 15 mph goes 47 miles downstream in the same amount of time that another boat going 20 mph goes 40 miles upstream. How fast is the current in mph?
question parqueting by an object is covering a plane by copies of the same object. can you parquet the plane by an
A plane is heading due south with an airspeed of 211 mph. A wind from a direction of 53 degrees is blowing at 17 mph. What is the bearing of the plane?
Identical twins must be the same sex, but the sexes of fraternal twins are independent. Find What is the probability of fraternal twins
Dividing a complex number with another number
sketch the graph of a fuction whose domain eqauls the interval [1,3] and whose range equals the interval [-2,4]
the perimeter of a rectangle is 54 feet. describe the possible lengths of a side if the area of the rectangle is not to exceed 152 square feet.
Using Excel to graph, prove whether the following equation could possibly be an identity or determine if it is definitely not an identity.
if 5 is subtracted from the numerator of a fraction the value of the resulting fraction is 13. however if 5 is added
The owner of the Rancho Grande has 2972 yd of fencing with which to enclose a rectangular piece of grazing land situated along the straight portion of a river. If fencing is not required along the river, what are the dimensions of the largest area..
explain a greatest common factor? how do you know when you have found the greatest
Senior Management at Esil University believes that decreases in the number of undergraduate applications that they have experienced are directly related to tuition increases.
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